Adding-machine.



' PATENTED APR. 26, 1904.

T. A. WHEELER. ADDINGMAGHINE. APPLICATION FILED MAY 9, 1903.

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. PATENTED AP 26, 1904'. T. A. WHEELER. ADDING MACHINE. APPLIOATIONIILED HAYS, 1903.

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PATENTED APR. 26, 1904.

T. A. WHEBLER. ADDING MACHINE.

APPLICATION FILED my 9. 1903.

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UNITED STATES Patented April 26, 1904.

PATENT OFFI E. I

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent 1V0. 758,198 dated April26, 1904.

Application filed May 9, 1903. Serial No. 156,451. (No model.)

To all whom it may concern.-

Be it known that I, THEODORE A. WHEELER, a citizen of the United Statesof America, re-

. siding at the city of New Haven, in the county of New Haven and Stateof Connecticut, have invented certain new and useful Improvements inAdding-Machines, of which the following is a specification.

This invention contemplates the production of an improved adding-machineof simple and durable construction to be rapidly manipulated by personsnot necessarily skilled by practice to mechanically add columns offigures in a manner to obtain absolute accuracy of result, and, further,the provision in a machine of this general character of simple andreadily operated means for retracting the parts after operation wherebyto reset the machine for subsequent additions.

Another object of the invention is the production of a very compact andreadily-portable adding-machine which can be manufactured at acostsufliciently low to encourage its general usage, although certainfeatures of the construction are possessed of advantages which rendertheir employment in calculating-machines generally highly desirable.

The following description, read in connection with the accompanyingdrawings, will enable any one skilled in the art to which my inventionrelates to understand its nature and to practice it in the form in whichI prefer to employ it; but it will be understood that my invention isnot limited to the precise form and details of construction hereinillustrated and described, as various modifications and changes may bemade without exceeding the scope of the claims in which my invention isset out.

Referring to the accompanying drawings, Figure 1 represents inperspective an addingmachine embodying my invention, the front of thecasing having an addition-index flanked by a slot, in which the key ormotor bar is manipulated in operating the internal adding mechanism of apair of wheels in opposite directions. Fig. 2 shows the internal addingmechanism in top view and the relation thereto of the key or motor barand a cam-lifted bar 58 and its depressing-spring for rotating the wheel16 backward. Fig. 3 is a vertical section taken on theline 3 3 of Fig.2, showing the cam-actuated pivoted bar for operating the wheel 16conjointly with the motor-bar for operating the wheel 15, the cam beingshown in position to allow the bar to rest on the non-lifting part ofthe cam. Fig. 1 shows in Vertical section the fixed shaft on which theadding-wheels are mounted to rotate freely and the coasting partsrotatable on said shaft. Fig. 5 shows in sectional de tail the dog 68 onthe pivoted bar 58, which operates to engage the teeth of theaddingwheel 16 to efiect its rearward rotation in conjunction with theforward rotation of the wheel 15, which is actuated by the key or motorbar. Fig. 6 is a detail top view of the toothed cams for moving the freeend of the bar 58 laterally for effecting the engagement of the dog 68with the adding-wheel 16. Fig. 7 is a horizontal section taken on theline 4: 1 of Fig. 3. Fig. 8 is a horizontal section taken on the line 55 of Fig; 3, showing the dogs which release the lock of theadding-wheels. Fig. 9 shows in side view the parts mounted on the'rightend of the shaft and the disk 89, havingthe pins 40 for engaging theshaft connected spring 35 to maintain the retracting tension of thespring. Fig. 10 shows the additionindex at the slot in which the key ormotor bar is manipulated in the teeth of the addingwheel 15, and alsoshowing the spring, which overlies the periphery of the wheel on theouter side of the teeth and at the outer side of the handle of the barand by which the key or motor bar is maintained in engagement with thesaid wheel.

Referring to the drawings by numerals,1 denotes the casing, which may beof the rectangu larform shown and which has a bottom 2, sides 3 4., aback 5, a front 6, and an open top closed by a removable cover 7, hingedto the back 5 and having sides 8 8 and a covered top 9. In the front ofthe cover-top 9 is a vertical slot 10,

at which is a series of numbers from 0 to 10, inclusive, and 11 is ahorizontal slot in said top, through which is displayed the numbers onthe addition-wheels presently to be described and which will show thetotal of the addition. The cover is provided with fastening means 12 tosecure it to the casing.

Erected from the base 2 are two posts 13 13, in the upper ends of whichis fixed a shaft 14, on which are loosely mounted a combined units andtens wheel 15 and a combined hundreds and thousands wheel 16. Each wheelhas a rim parallel with its axis and is provided at its periphery withnumerals ranging from Oto 99, and the wheel 15 has a series of teeth 1717 projecting laterally from the edge of the rim, theteeth correspondingin number to the number of numerals on the periphery, and said teeth arepreferably so disposed as to bring the intervening spaces opposite tosaid numerals. The wheel 16 is provided with teeth 18 18,similarlylocated and disposed. Loose on the shaft is a hub or collar 20, fixed tothe wheel 15 and having an annular groove 21, in which is rotativelyconfined the inner eircularly-bent end 22 of a motor or key bar 23, thefree outer end of said motor or key bar being vertically movable in theslot 10 of the cover and terminating in a finger hold or button 24:. Thekey-bar is permitted a lateral movement limited by the right-hand wallof the slot 10 and by the base of the spaces between the teeth 17 of thewheel and also a vertical movement between the limits defined by the topof said slot 10 and the shaft-lineof the casing-front. Normally thewheels 15 and 16 are positioned to expose through the slot 11 theportions of their peripheries containing the ciphers, and in snchposition the key or motor bar occupies the space between the teeth ofwheel 15 at the bottom of the slot 10. 1n practice rotation of the wheel15 to obtain the additions up to and including 99 is effected bydisengaging the key-bar from the initial space at the bottom of thevertical slot by movement to the right, pushing with it the spring-arm,by elevating the key-bar to a point opposite the numeral on the fixedcolumn by the slot to be added, by moving the key-bar to the left tocause engagement with the adjacent teeth 17, and, finally, by depressingthe key-bar lever, and thereby rotating the wheel the desired extent,determined, as before stated, by the base of the slot 10, to display atthe slot 11 the selected numeral. Accidental disengagement of thekey-bar from a tooth 17 is prevented by a spring 25, attached at itslower end to the inner wall of the casing-front and extending parallelto the rim of the wheel 15, lying on its teeth outside of the bar tohold it between the teeth, and said springalso serves automatically tomove the key-bar laterally to the left after elevation or depressioninto engagement with a teeth. In Figs. 1, 2, and 3 this spring is seenas a wire lying across and against the teeth between them and the innerwall of the casing, with its upper end free but held under the casing atthe slot to keep it in place on the teeth, so that by pressing thebandle of the motor-bar to the right the spring will be moved out toallow the handle of the bar to be raised to engage the teeth at thedesired point indicated by the numeral of the fixed column to be added,the slot being of a length to expose a teeth of the wheel for eachnumeral along the edge of the slot.

The wheel 15, as will presently be explained, is retracted to normalposition by the action of a coiled spring, and said wheel is heldagainst such retractive movement after each partial rotation by aspring-pawl 26, secured at one end to the adjacent post 55 and havingits free end formed to engage the teeth 17 in one direction. After theoperation of adding is completed to unlock the wheel and allow of itsreverse rotation by the coiled spring there is employed an arm 27,pivoted at 28 and intermediately engaging an opening in a proection 29on the spring-pawl 26. The forward end of the arm 27occupies ahorizontal slot 30 in the casing front, said end projecting beyond thefront, and in operation the arm is moved laterally to the left, anddisengagement of the spring-pawl from the teeth 17 effects the releaseof the wheel 15 and allows of the rotation of the latter by the coiledspring.

The wheel 16, which is also retracted by the power of a coiledspring,'is held against reverse rotation after partial or completeforward rotation by a spring-pawl 31, fixed at its inner end to a plate32 and engaging mediately of its length teeth 18. The pawl 31 is retracted to'release the wheel by movement of an arm 38, which forms anextension of the pawl and occupies a slot 3 1 in the casing front.

The wheel 15 is rotated against the action of a spring 35, Fig. 4,coiled about the sleeve of the collar 36 and secured at its inner end tosaid sleeve, which is fixed by a set-screw 37 to the shaft, whereby,when desired, the tension of the spring is maintained. The coils of thespring are confined in a housing 38 through an opening in which theouter end of the spring extends adjacent to the outer face of a diskhaving face-pins. Fixed to the wheel 15 to move therewith, and henceloose in the shaft, is a disk 39, carrying a series, preferably four, oflaterally-projecting pins 40 10, which are successively engaged by theouter end of the spring in the following manner: Inasmuch as a number ofrevolutions of the wheel would contract the spring-coils to such anextent as to give undue tension to the spring and great retractive forceto the wheel 1 provide for a limited contraction of the coils,regardless of the extent of rotation of the wheel. The housing 38, whileadjoining, is free from the disk 39; but in the movement of the wheel 15said housing is partially rotated through the engagement of the end ofthe spring with one of the pins 40. Secured to the casin g side 4 is anarm 11, which has its outer end formed with an inclined shoulder 42,maintainedin the path of the end of the spring 35 by the contact withthe rim of the disk 39 of an offset 43 on the arm. The extreme end ofthe spring after passing through the housing-opening is in engagementwith one of the pins 40. Rotation of the wheel 15 carries with it the'end of the spring, and when said end comes into engagement with theinclined shoulder 42 the latter disengages said spring end from the pin,and said end being free instantly retracts, carrying with it the housinguntil the next pin 40 is reached, when reengagement of the pin andspring-arm takes place. This retractive movement of the spring isinsufiicient to cause undue expansion of the spring-coils. Consequentlya suflicient tension is maintained to return the wheel tofirst positionafter release. The disk 39 is provided in its rim with a shoulder 46,Fig. 9, and 47 is a stop-arm extending from the front of the easing backinto the path of the shoulder 46 to check the return. or rearwardrotation of the wheel when the latter has reached its normal position.The return movement of the wheel 16 is similarly checked by astop-arm48, engaging a shoulder 49 on a disk 50, fixed to and rotatingwith said wheel 51. Fig. 4 is a coiled spring fixed at its inner end tothe collar 54 and fastened at its outer end to a pin 52 on the disk 50.The spring, which is incased in a housing 53, operates to retract thewheel 16 after rotation, and inasmuch as said wheel is limited inoperation to a single rotation no meanssimilar to the spring-releasingmeans of the wheel 15 are necessary. 54 is the set collar or sleevebetween the disk 50 and adjacent post 13, and to this collar the innerend of the spring 51 is fastened, and while joining the disk 50 is notfastened to it, and is therefore free to be set on the shaft to adjustthe spring. At each complete revolution of the wheel 15 the wheel 16 isreversely rotated an extent equal to the distance between two of thenumerals thereon, and consequently equal to the distance between two ofthe teeth 18. The means for locking the wheel after forward movement forreleasing it for retracting it to first position and for checking itsmovement at said position have been fully set forth, and I will nowdescribe the means for effecting its forward movement after a completerevolution of the wheel 15. Erected 4 from the base 2 is a post 55, Fig.3, to the upper end of which is pivoted by a horizontal pin 56 a rod 57.The rod passes at its upperend through an opening in a bar 58, whichextends approximately parallel with the wheel 15, and the function ofthis bar is to rotate the wheel 16 backward. The rod 57 forms a verticalpivot for the forward end of the bar, and as said rod is pivotedhorizontally on the post '55 the bar is permitted to have at its rearend both a vertical and a horizontal movement. The elevation of the baris against the action of -a coiled spring 59, and such vertical movementis obtained by a cam 60, Fig.3, carried by the hub 61, which is formedwith hub of wheel 15 and rotatable with it. Lateral movement of the barto the right, looking from the front, to, engage its dog with the teethof the wheel 16 is effected through the engagement of a tappet ortoothcam 62, Figs. 2, 6, and 7, carried by a disk 63, rotatable with theWheel 15, with a tooth or shoulder 64 on the side of the bar 58, themeeting surfaces of the cam-tooth and toothshoulder being inclined, asseen in Fig. 6, whereas the opposite surfaces are abrupt or parallelwith the axis of the shaft to insure a quick return lateral movement ofthe bar after disengagement of the cam and shoulder. Likewise the underside of the bar 58 and the cam 60 are formed to obtain a quickdepression of the bar, the latter being recessed, as at 65, to receivethe cam after it has passed the point shown at 66. The spring 59 inaddition to retracting the bar after elevation also retracts said barafter movement to the left, looking from the front; but it is the fallof the bar down the incline which positively gives this retracting leftmovement to the bar to release its dog from the teeth. The rear end ofthis bar terminates in a right-angled extension 67, carrying a dog 68,which latter in the normal or lowest position ofthe bar is free ofengagement with the wheel,

as in Figs. 2 and 3 and as seen in dotted lines in Fig. 5, the doghaving been moved to such position by the dropping of the bar. In Fig. 5the dog is shown in full lines as engaged between two teeth, and this isthe position of the bar when raised and moved to the right, so that whenit drops it will pull down the wheel with it and be moved to the left.For this purpose the relation of the cam-tappets and the bar-lifting camare such that the movement of the dog to engage the.

teeth of the wheel will precede the falling movement of the bar to carrywith it the wheel one point, and for this purpose the cam-tappets arearranged to effect such engagement before the lifting-cam allows the barto fall and by its weight and the pulling down of its connected springrotate the wheel.

In Fig. 3 the drop-bar 58 is shownin its lowest position by the trippingaction of the lifting-cam 60, and in this position the bar will rest onthe non-lifting part of the cam. The cam and the disk 63 being bothfixed to and carried and ,moved together by the hub of the wheel 15, therelation of the liftingcam to the tappet-cam is such that while the baris being lifted by the hub-cam the rotation of the disk with the wheelwill carry the tappet-cam. up into engagement with the tap-' pet-cam 64on the bar to move the dog of the latter into engagement with the teethof the wheel 16, and these two cams are relatively fixed, so that thehub-cam will reach the notch or recess and allow the bar to fall, andquickly following the continued rotation of the wheel will cause thetappet-cams to pass each other, and in doing so the bar will be moved bythe action of the spring 59 to the left to disengage its dog.

In operation, as the wheel 15 approaches a complete revolution the cam60 engages the bar 58 and elevates it to bring the dog 68 opposite thenext adjacent tooth 18, whereupon the cam 62 is brought into engagementwith the shoulder 6 1 on the bar, with the result of moving the latterto the right to cause the dog to engage said tooth, as in Figs. 5 and 7.Immediately upon said engagement the highest point of the cam 60 tripspast the point 66 on the bar, and a similar disengagement takes place atthe shoulder or cam-tooth 6 1 and cam-tooth 62, with the result ofreleasing the bar and allowing the spring 59 to depress the bar whilebeing retracted to the left to engage its dogs, as in Figs. 2 and 3. Inthe depression of the bar the wheel 16 is rotated by engagement with thedog a distance equal to a space between two of its peripheral numerals,consequently bringing a new numeral opposite to the slot 11. Theprovision for effecting the movement of bar 58 to the left consists ofarm 69, extending from the side t of the casing, and terminates in adownward-inclined end 70 beneath and in the path of the drop-bar 58, andthe purpose of the inclined end of this arm is to cause the bar as it isdropped from the cam 60 to slide down and toward the tooth edge of thewheel 15, and thereby carry the dog68 of the angled end of the drop-barout of and away from the teeth of the wheel 16, and thereby leave thelatter free to be returned to its normal position ready for the nextaddition. In this movement of the bar to disengage its dog from theteeth 18 it is limited by the toothed cams 62 and 6 1, abutting againsttheir respective parts, the disk 63 and the side of the drop-bar 58, asshown in Fig. 6. The movement of the drop-bar to the right is limited bythe engagement of the toothed earns 62 and 6 1, as seen in Fig. 7, whichshows the point-s of the toothed cams resting upon each other, andthereby limits the movement-of the bar 58 to the right, and has engagedits dog with the teeth 18 of the wheel 16. The wheel 15 has a doublefunction that is to say, its numerals indicate units and tens, andtherefore does the work of a separate unit and a separate wheel oftenswhile the Wheel 16 also has two functions-that is to say, itsnumerals indicate hundreds and thousands, and therefore does the work ofa separate hundred and a separate thousand wheel. The importance of thedouble functions of the adding-wheel is therefore seen to givecompactness and a simple construction.

It is important to note that each toothed wheel is rotated by separatemeans, the one with a forward movement effected by the hand motor-barand the other with a rearward movement effected by the drop-bar, themovement of which is rendered automatic so that the movement of onewheel controls that of the other and the rotation of both side by sideinopposite directions is' 'portant to note that while the wheels rotatein opposite directions vertically side by side their numerals areexposed at the same opening with the result of the addition and thatthis exposure is effected with unerring ac curacy by the manipulation ofthe single motor-bar in its function of pulling down the wheel 15 fromany one from 0 to .10 of the numerals of the fixed column and that suchpresentation of the result of the addition is unerringly determined bythe bottom of the slot, as in Fig. 1, which limits the pulling down ofthe motor-bar, and therefore determines the extent of the downwardmovement of said Wheel. For every movement of the bar in traversing thefixed column of numerals it must always be limited in its descent by thebottom of the slot, and that limitation exactly brings the numerals onthe wheel 15 to the sight-opening as each addition is made. It will alsobe seen that to whatever extent the wheel 15 is moved its teeth willstand in alinement with the teeth of the wheel 16 and that the numeralsof the teeth of each wheel will be in alinement with each other and withthe spaces between the teeth of each wheel, so that whatever numeral onthe units-wheel 15 which may be presented to the slot 11 the movement ofthe dollar-wheel 16 will present its numerals in the same line at theslot. This relation of the teeth and numerals of the wheels is effectedand maintained by the engagement of the spring-pawl 26 with the teeth ofthe wheel 15, and it will be understood that the engagement of thespringpawls 26 and 31 will hold the wheels from turning against theretracting action of their respective coil-springs and 51; but the pawl26 will allow the wheel 15 to be rotated forward, and the pawl 31 willallow the wheel 16 to be rotated backward, the downward movement ofthewheel 15 being always limited by the stop formed by the bottom of theslot 10 to bring and to hold the teeth 17, so that the pawl will enterthe space between the teeth at such stop, while the sleeve 61, uponwhich the cam-lifted bar 58 rests,will form a stop to limit the descentof said bar, and thereby move the wheel 16, so that the space betweenits teeth will receive the pawl 31 to lock said wheel.

I claim 1. In an adding-machine, a casing, a shaft fixed therein, a pairof adding wheels rotatively sleeved vertically adjacent to each other onsaid shaft, each having peripheral numerals and teeth corresponding tothe numerals standing in alinement from the opposite edges of thewheels, a bar crossing the toothed side of the wheel pivoted at itsfront end and terminating at its free end in a dog at the toothed sideof the wheel 16, means for supporting the free end of the bar, meansoperated by the rotation of the wheel 15 to impart to the free end ofthe bar a vertical and a lateral movement for engagement anddisengagement of its dog with the teeth of the wheel 16 to pull thelatter down at the rear, and a motor-bar on the sleeve of the wheel 15,adapted to engage the teeth thereof to pull'it down at the front.

2. In a calculating-machine, a casing having a vertical slot, a shaft, awheel having peripheral numerals and teeth corresponding to thenumerals, a motor-bar on said shaft having its handle end projectingthrough the slot and controlled in its movements .to engage and pull thewheel down the proper distance determined by the lower edge of saidslot, a spring-arm at the slot along the teeth for 1 holding the bar inengagement, means for locking and means for releasing the wheel aftereach partial rotation.

3. In a calculating-machine, a spring-retracted rotatable wheel having aperipheral series of numerals and an annular series of.

teeth at said numerals, a collar on the shaft of said wheel, and a motoror key bar having an inner end engaging the collar and permittingvertical movement of the key-bar to rotate thewheel after engagementwith a tooth, said key-bar being also laterally movable to permit suchengagement.

1. In a calculating-machine, a casing having a vertical slot, a fixedcolumn of numerals from O to 10, at said slot, a separate slot at theupper end of said fixed column of numerals, a shaft, a wheel thereonprovided with peripheral numerals and teeth corresponding with thenumerals, the relation of the'teeth to the vertical slot exposing onetooth for each numeral of the fixed column, a motor-bar on the shaftextending through said slot and adapted to engage the teeth, therelation of the two slotsbeing such that the bottom of the vertical slotwill determine the movement of the wheel to expose the proper numeral onits periphery at the slot above the fixed column of numerals.

5. In an adding-machine, a casing, a shaft therein, a rotatable wheelsleeved thereon, a disk fixed on said sleeve and provided with aplurality of pins, a spring coiled on and having one end fixed to theshaft, the other end of the spring engaging one of said disk-pins, thewinding of the spring by the rotation of the wheel causing itsretraction, and means automatically to disengage the free end of thespring successively from one pin to another during the rotation of thewheel whereby the winding and expansion of the spring is ren- 'deredpartial during a complete revolution of 'shaft projecting through theslot and adapted 'to have a movement therein laterally intoand out ofengagement with the teeth and movable vertically in said slot to pullthe wheel down, a stop to limitthe descent of the'bar, a spring 35connecting the shaft and wheel-hub and against the action of which, thewheel is r0: tated, and means for locking and releasing the wheel aftereach pull-down of the motor-bar.

' 7. In a calculating-machine, a rotatable wheel having numerals, meansfor moving said wheel, a disk movable with the wheel and carrying aseries of pins, a coiled spring fixed at its inner end and having itsouter end adapted for successive engagement with said pins, and meanseffecting the disengagement of the spring end. I

8. In a calculating machine, a rotatable wheel having numerals, meansfor moving said wheel, a disk movable with the wheel, a coiled springconnected at one end with the disk, and a collar removably fixed to thewheel-shaft and to which the other end of the spring is attached.

9. In a calculating machine, a rotatable wheel having numerals means formoving said wheel, a disk rotatable with the wheel and provided with ashouldervand a series of pins, a stop-arm in the path of the shoulder, acoiled spring fixed at its inner end and adapted to engage the pins ofsaid disk, and an arm having an inclinedshoulder extending into the pathof the outer end of the spring to release it from the pin.

' 10. In an adding-machine, a casing, a shaft fixed therein, a pair ofwheels 15 and 16 rotatively sleeved vertically side by side on saidshaft, each having peripheral numerals and teeth corresponding to thenumerals, standing from the outer side of the rims in oppositedirections, a motor-bar on the wheel-sleeve engaging the teeth of thewheel 15 to pull it down at the front, a cam and a disk 63 both fixed onthe sleeve, a pivoted bar. 58 atthe toothed side of said wheel 15,extending over the cam and terminating in a dog 68 adapted to engage theteeth at the rear of the-wheel 16, a tappet 62 on the disk and a tappct64 on the bar for engagement to cooperate with the lifting function ofthe cam to move the dog to effect its engagement with the teeth of thewheel 16 to pull it down at the rear and a spring connected to said barto force the dog out of engagement.

11. In an adding-machine, a casing, a shaft fixed therein, a pair ofadding-wheels, rotatatively sleeved adjacent to each other on saidshaft, the rim of each having peripheral numerals, and teethcorresponding to the numerals standing in alinement from the oppositerim edges, the numerals on each wheel also standing inalinement, amotor-bar on the shaft of the wheels for engaging and pulling the wheel15 down at the front, a stop to limit the downward movement of the barand wheel, a lifting and falling bar for engaging and pulling down thewheel 16 at the rear, a stop for limiting the downward movement of saidwheel and bar, and means for locking each wheel.

12. In a calculating-machine, a rotatable toothed wheel having numerals,a laterally and vertically movable tooth-engaging keybar for moving saidwheel, a second rotatable wheel having numerals, and means for partiallyrotating the second wheel upon a com: plete rotation of the first wheelincluding a device having a combined vertical and lateral movement.

13. In a, calculatingmachine, a toothed wheel having numerals, alaterally and vertically movable tooth-engaging key-bar for moving saidwheel, a second wheel having numerals, and means for partially rotatingthe second wheel upon a'complete rotation of the first wheel in adirection opposite to that of the latter including a spring-retractedbar pivoted to have a vertical and a lateral movement for engaging anddisengaging the second wheel.

14. In an adding-machine, a shaft, a pair of wheels thereon inverticallyjoining relation, each having peripheral numerals and teeth,the latter standing in opposite directions from the rim of each wheel, amotorbar engaging the wheel 15 at the front for rptating it forward, andmeans for partially rotating the wheel 16 backward, including a bararranged. across the diameter of the wheel 15, its free end extending toand crossing the rear of both wheels, and terminating in a dog forengaging the wheel 16, a cam on the shaft for lifting said bar, a diskfixed to rotate with the wheel 15, and having a tappet, and a tappet onthe bar, the tappets and the cam having such relation as to cause thefree end of the bar to be lifted in advance of the joint action of thetappets to move the bar laterally.

15. In an adding-machine, a casing, a shaft therein, a pair of wheelsloose thereon in vertical joining relation, each having peripheralnumerals and teeth standing parallel to the axis in opposite directionsfrom the edge of the rim of each wheel, a motor-bar 23 for engaging thewheel 15 at the front for rotating it forward, a drop-bar 58 forengaging the wheel 16 for rotating it backward, means op-.

erated by the wheel 15 to release such engagement, a stop to limit thedescent of the motorbar, a stop to limit the descent of the dropbar,means for limiting its range of move ment a distance of one point, aretractingspring for each Wheel, a spring-dog for locking and releasingeach wheel, the motor-bar and the spring-dogs each having a handle atthe front for operating it.

16. In an add ing-machine, a casing, a shaft therein, a pair of wheelsloose thereon in vertical joining relation, each having peripheralnumerals and teeth standing parallel to the axis in opposite directionsfrom the edge of the rim of each wheel, the numerals of each wheel inalinement with the spaces between the teeth, means for operating thewheels in opposite directions and means for limiting such rotation sothat every movement of the wheels for every addition will bring theteeth of both wheels in alinement and the numerals of each wheel inalinement with the spaces between the teeth and the extent of themovement of the dollar-wheel will be limited to the distance equal totwo of its teeth.

17. In an addingmachine, a casing, a shaft therein, a pair of wheelsloose thereon joining side by side each having peripheral numerals andteeth standing parallel to the axis in opposite directions from the edgeof the rim of each wheel, the numerals of each wheel in alinement withthe spaces between the teeth, a hand-operated bar extending through thefront of the casing for engaging the teeth at the side of one of thewheels, to rotate it forward and a pivoted bar at the side of the samewheel extending rearward, and terminating at the rear of the wheels,means automatically operating said bar to rotate the other wheel byengagement with its teeth at its rear side, stops to limit and determinthe range of movement of each wheel, and a column of numerals at thefront cooperating with the numerals of both wheels to make the addition.

18. In a calculating-machine, a toothed wheel having numerals, andteeth, a laterally and vertically movable tooth-engaging keybar forrotating it, a second toothed wheel having numerals, a spring-retractedbar hav ing a tooth-engaging dog, an arm having a downward-inclined endfor laterally moving the bar and a cam for vertically moving the bar.

19. In a calculating-machine, a toothed wheel having numerals and teeth,a laterally and vertically movable tootlrengaging keybar for rotatingit, a second toothed wheel having numerals, a bar mounted at one end tohave up-and-down and right-and-left movements, a tooth-engaging dogatthe opposite end of the bar, a cam for imparting to the bar its verticalmovement against spring action and a downward incline arranged toreceive the fall of said bar to impart to it its lateral movementagainst spring action.

20. In an addingmachine ,a pair of numeralwh'eels joining verticallyside by side on the same shaft and rotatable in reverse directions, aseparate motor-bar for each Wheel, one motor-bar the means for operatingthe other, each having a falling movement to engage and pull down itsengaged Wheel, the movement having a tappet coacting With thedisk-tappet of one-being by hand, that of the other being and having apull-down spring at its rear end, automatic. v for operation in the Waydescribed.

21. In an adding-machine,a pair of numeral- In testimony whereof I aflixmy signature in 5 Wheels joining vertically side by side on the presenceof tWo Witnesses.

same shaft and rotatable in reverse directions;

a disk having a tappet, and a cam both rota- THEODORE WYHEELER tableWith the forward rotating Wheel, a mo- Witnesses: tor-bar for the latterWheel and a motor-bar A. E. H. J OHNSON,

IQ for the rearward rotating Wheel, the latter bar GUY HAMILTON JOHNSON.

